Using HTML5 to develop Android (5)---HTML5 geolocation service for Android applications

In Android

Java code

1 //enable geo-targeting2Websettings.setgeolocationenabled (true); 3 //set the location of the database path4 Websettings.setgeolocationdatabasepath (dir); 5   6 //Configure permissions (also implemented in webchromeclient)7  Public voidongeolocationpermissionsshowprompt (String origin,8 geolocationpermissions.callback Callback) {   9Callback.invoke (Origin,true,false); Ten     Super. Ongeolocationpermissionsshowprompt (origin, callback);  One}

Adding Permissions in Manifest

XML code

1 <  android:name= "Android.permission.ACCESS_FINE_LOCATION"/>  2  <android:name= "Android.permission.ACCESS_COARSE_LOCATION" />  

   in HTML5;  obtaining geo-location information from navigator.geolocation objects  
  Common Navigator.geolocation objects are available in the following three ways:  
 
 

 1  //  2     Navigator.geolocation.getCurrentPosition (Success_callback_function, error_callback_function, position_options)  3  //  4   Navigator.geolocation.watchPosition (Success_callback_function, Error_callback_function, position_options)  5    Clear the persistent get geo-location event  6  Navigator.geolocation.clearWatch (watch_position_id) 

Where Success_callback_function is the function that is processed after success, Error_callback_function is the handler function returned after the failure, the parameter position_options is the configuration item

The code in JS

JS Code

1 //positioning2 functionget_location () {3     if(navigator.geolocation) {4Navigator.geolocation.getCurrentPosition (show_map,handle_error,{enablehighaccuracy:false, maximumage:1000,timeout:15000}); 5}Else {   6Alert ("Your browser does not support HTML5 geolocation"); 7     }   8 }   9        Ten functionShow_map (position) { One     varLatitude =Position.coords.latitude;  A     varLongitude =Position.coords.longitude;  -     varCity =position.coords.city;  -     //telnet localhost 5554 the     //Geo fix-82.411629 28.054553 -     //Geo fix-121.45356 46.51119 4392 -     //Geo Nmea $GPGGA, 001431.092,0118.2653,n,10351.1359,e,0,00,,-19.6,m,4.1,m,,0000*5b -Document.getelementbyidx_x_x_x ("Latitude"). Innerhtml= "Latitude:" +latitude;  +Document.getelementbyidx_x_x_x ("Longitude"). Innerhtml= "Longitude:" +longitude;  -Document.getelementbyidx_x_x_x ("City"). Innerhtml= "City:" +City ;  + }    A         at functionHandle_error (err) { -     Switch(err.code) { -      Case1:    -Alert ("Permission Denied");  -          Break;  -      Case2:    inAlert ("The network is down or the position satellites can ' t be contacted");  -          Break;  to      Case3:    +Alert ("Time Out");  -          Break;  the     default:    *Alert ("Unknown error");  $          Break; Panax Notoginseng     }    -}

Where the Position object contains many data error codes and options to view the document

Using HTML5 to develop Android (5)---HTML5 geolocation service for Android applications